Wow the Outrage Evo 55 is hard to tune we ran couple tank tuning from a very experience guy. We got close to tuning and couple flight we'll have her tune. But it's a pain of a butt. A lot of engine shut off. A lot of tweaking the lowend needle. I don't recommend nobody to run this muffler. Chamber is a bit to big for os 50 hyper. I'm gonna get her tune right and post here how she fly. But not a good idea for OS 50 hyper. Maybe a YS 56 though. Chamber is where it lie the problem I bet. Simply to big.

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Hi my name is Jim and I am a Heliholic. Darn Heli-Crack Addiction!! lol
The heli virus has infected me and i hope that there is NO CURE!